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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1298) adding user info to file
Date Fri, 07 Dec 2007 19:31:43 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12549528
] 

Raghu Angadi commented on HADOOP-1298:
--------------------------------------

> My current patch only optimizes memory usage but not CPU usage since CPU usage is not
critical compared to memory in NameNode. I will run some test later on to see whether there
is a need to do the improvement.

I don't see how this is related to memory usage. I think memory optimizations can still stay.
I think the current patch would affect NNBench open() benchmark quite a bit. Whether it needs
improvement or not I think is more of a subjective question. But I think we can quantify how
much more cpu is required. 

> Why is it not correct? Can you explain more?
Because permission checking and actual action are not done in the same log. For. e.g. namesystem.delete()
: we check for write permission and then lock FSNamesystem to delete. By that time, the file's
permissions could have changed.

> adding user info to file
> ------------------------
>
>                 Key: HADOOP-1298
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1298
>             Project: Hadoop
>          Issue Type: New Feature
>          Components: dfs, fs
>            Reporter: Kurtis Heimerl
>            Assignee: Christophe Taton
>         Attachments: 1298_2007-09-22_1.patch, 1298_2007-10-04_1.patch, 1298_20071206b.patch,
hadoop-user-munncha.patch17
>
>
> I'm working on adding a permissions model to hadoop's DFS. The first step is this change,
which associates user info with files. Following this I'll assoicate permissions info, then
block methods based on that user info, then authorization of the user info. 
> So, right now i've implemented adding user info to files. I'm looking for feedback before
I clean this up and make it offical. 
> I wasn't sure what release, i'm working off trunk. 

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